What could stop Vladimir Putin's war in Ukraine?

As Vladimir Putin moves closer to a full blown war in Ukraine by ordering troops into two separatist regions in the east of the country, western nations are rolling out sanctions in a bid to bring the Russian leader back from the brink.  Bill Browder, the American businessman instrumental in a long-running campaign to sanction the Kremlin, says only the toughest financial consequences will deter Putin, who's desperate to retain his immense wealth and stay in power.  Today, we ask him: What makes the Russian leader tick, and can anything stop a bloody, protracted war?  Featured:  Bill Browder, businessman and political activist